Material working apparatus



June 8, 1948.

A. M. MISSBACH MATERIAL WORKING APPARATUS Filed Aug. 9, 1945 3Sheets-Sheet 2 70 SUCTION m/z/i/vm? A M lid/558A CW June 8, 1948. A. M.MISSBACH MATERIAL WORKING APPARATUS 3 Sheets-Sheet 3 Filed Aug. 9, 1945I I 'i A. M M/S'SBACH 5/144 [.41 4

Patented June 8, 1948 S OFF 'I'ICE.

MATERIALWORKING APPARATUS Arthur M, Missliaeh, Riverside, 111., assignorto Western Electric. Company, Incorporated, New York, N, Y., a.corporation of New York Application August 9, 1945,.Seria1 No. 609,879

13. Claims.

This invention relates. to material working apparatus and moreparticularly to punch and die apparatus for perforating and trimmingterminals projecting laterally from electrical resist'ors;

The invention is particularly usefulin perforating'an-dtrimming fiattype terminals projecting laterally-"from ceramic coated electricalresistors following the'steps in the method ofmanufacturing resistorsdisclosed in application; Serial No. 605,133, filed July 14, 19.45,.n0wU. S. Patent No; 2,427,417, granted September '16; 1947, to A. J.Prickett, which includes the step ofremoving from opposite fiat surfacesof the terminals a ceramic-coating which had. been applied thereto toprevent'oxidation of the surfaces of the-terminal'sjduring the firing oftheceramic coating material: Generally, upon completion of thereferred-to method, some ceramic coating re-- mains on the edges of theprojecting terminals, which still have to be-rounded 01f at their outerends and perforated so. thatwire maybethreaded through the holeandsoldered-connections made;

An object'of'the present invention is to provide an efiicient' andpracticable apparatusfor workingthe above-referred-to" terminal whileattachedto theresistor, whereby it is simultaneouslyperforated andtrimmed around its edge to remove any ceramic coating thereon and itsouter end roundedwflf;

In attaining this object, there is provided, in one embodiment of' theinvention, cooperating fixed and movable punch and die members forworking the terminal while attached to the resistor, a resilientlymounted element substantially surrounding; thefixed punch and normallypositioned thereabove and shaped to formmeans for" laterally guidingaterminal into position against" astop member thereon for workingand; incooperation with the fixed punch, anest'for supporting; theterminalduring" its working: A movable air-exhaust duct carriedby theresiliently mounted terminal guide and-nesting element isreciprocativeupon a stationary-air exhaust duct,

whereby the two ductsare atall times in communicaticn; the inlet of themovable duct being arrangedand effective to constantlydraw from theapparatusall materials trimmed: from the edges of-the terminal.airexhaust duct, an air blast is connectedto'andpasses through the fixedpunch, which iseffective to; cause" a heavier end" portion, trimmed offthe-terminal,- torbe'liftedfoffithefiired-punch and carriedaway-by theairexhaust'system:

Gther objects and advantages 'ofthisinvention- In cooperation with thewill'inore fullyappear from the'following detailed description, taken inconjunction with the ac-- companying drawings, wherein Fig. 1 is afragmentary irregular vertical sectional View taken on. the line |l asFig.

through the 1 punch and dieapparatusembodyingthe-present'invention,the-apparatus being shown in its normal positionwith a cross 'section'ofa terminal nested thereon ready to be--worked;

Fig. 2 is a fragmentary vertical sectionalview, partly in elevation,taken on the line 2"2"of F-ig 4, the apparatus being shown inits normalposition, similarto-that of Fig. 1-;

Fig. -3is a fragmentary'vertical sectional view, similar to Fig. l,show-ing the apparatus in afully operated position and before theretraction of the movable die;

Fig. 4-' isapl aniview, partly in section, taken on theline 4-42of Fig'.'1' 'ofifthat por-tion' dfthe-app'aratus situated belowthe movable die;and

Fig. 5isa-plan View of one-type or electrical resistor illustrating-itsterminals at opposite ends before and afterbeing worked upon eythe-apparatus-of this invention.

As illustrated in the drawings, the punch and die apparatus embodyingthefeatures of this invention is operativel'y connected toa punch press,which may be of any usual type. Since it is not essentialt'o a completeunderstanding of the invention, the punch-press has not beenillustrated,except those parts directly concerned with this invention, whichconsist, of the following: A

vertically reciprocative ramand a stationary bed Ill and H,respectively- (Fig. 1)". Fiiied tothetop face-of the bedl-isa bolsterplate t2; towhich are amxed guide posts I3- that extend into aperturesMina reciprocative die andpunch'headi5.

Secured to thetop face of'tliebolster plate 12 1's a punch l6, whichginthe operation of the-appara! tus; cooperates with a die I? fixed. to-and'depending from the bottom face of the-die and punch head I5; whichsecured to and reciprocateswith the ram i5= to worka terminal 18projecting laterally fromthe resistor 20 (Figs. 2, 4 a'nd 5)-.Surrounding and reciprocative-on= the upper vertical end of thefixedpunch i6" is a resiliently mounted terminal guide --and nesting member'21, which is-guidedin its move;-

ments by a pair of guidepins 2 2 (Fig. 4-) securedtoand depending fromthe nestingmember 2i and at their lower-endsslidably fitted in apextures- 23 in the bolster plate l2 The nesting member" 2-! is resilientlysupported" in its upper normal position, as shownin Fig; 1', by aplurality of" compression springs 24, bearing at opposite ends onopposed faces of the member 2| and the bolster plate l2 and surroundingheaded screws 25 secured to and depending from the member 2|. Downwardlyfacing shoulders 23 are formed in the lower ends of apertures 21 in thebolster plate l2, in which the headed screws reciprocate, and againstwhich the inner annular faces of the screw heads abut to limit theupward movement of the nesting member 2| to its normal position (Figs. 1and 2).

It will be observed, referring to Figs. 1 and 2, that the member 2|,when in its normal upper position, is above the upper face of the fixedpunch Hi, the distance being suitably greater than the thickness of theterminal l8 to be worked. This arrangement results from an upwardlyextending rectangularly shaped portion 29 of the member 2| being formedwith a horizontal irregularly shaped slot 30 in its upper face, whichextends completely thereacross. The forward end of the member 2| and itsupper portion 29, as viewed in Fig. 4, and the left end thereof, asviewed in Fig. 2, is formed with a vertical slot 3| which intercepts theslot 30 and in which the upper end of the fixed punch l5 freely fits. Inthe normal position of the member 2| (Figs. 1 and 2), the upper face ofthe fixed punch l6 lies in the plane of the bottom face of the slot 30.Thus, the vertical walls of the slots 30 and 3|, in cooperation with theupper horizontal face of the punch I3 and the bottom face of the slot30, provide a guide and nest for receiving the terminal l8 to be worked.A stop member 32 fixed to the member 2| and extending into the slot 30serves to definitely position the terminal l8 longitudinally in the slot3|). As the terminal I8 is inserted into position, its outer end edge,which is square before being worked upon, abuts the stop member 32.

Carried by the resiliently mounted guiding and nesting member 2| is anair exhaust duct 35 (Figs. 2 and 4), having a tapered aperture 33therein. At its smaller end, the walls of the aperture 35 are alignedwith a tapered portion 3'! of the slot 30 in the member 2| and thelarger end of the aperture is at all times in communication with anaperture 38 in a stationary air exhaust duct 39 fixed to the bolsterplate l2, which is connected to a suitable source of constant airsuction (not shown). This air exhaust system serves to draw from thepunch and die members l6 and I! all ceramic and other materials trimmedfrom the edges of the terminal l8. Cooperating guideways and guides 42and 43 on the ducts Y35 and 39, respectively, serve to minimize airleakage between the ducts as the duct 35 is guided up and down on theduct 39 in the operation of the apparatus. Fixed in a shoulderedaperture 44 (Fig. 2) in the member 2| is one end of a tube 45 having itsopposite end slidably fitted in an aperture 46 in the stationary pun-chIS. The aperture 46, at its lower end, communicates, by means ofsuitably arranged apertures 49 and 50, in the bolster plate !2, with ahose or pipe 5|, which is connected to a suitable source of air pressure(not shown). A blast of air may thus be directed upwardly at a point infront of the stop member 32 and directly under a relatively heavyportion trimmed from the end of the terminal in providing the terminalwith a rounded outer end. This blast of air is preferably intermittent,and controlled by means (not shown) from the movements of the ram I0,whereby, as the upper movable die I1 is retracted, the trimmed endportion of the terminal I8 is lifted from the punch I6 and above thestop member 32 whereat, by the action of the air exhaust,

4 it will be carried away through the ducts 35 and 39 along with allceramic and other materials trimmed from the edges of the terminal.

Reciprocative in a die aperture 52 of the die is a spring-pressedshouldered shedder 53, which, in the normal retracted position of thedie I! (Figs. 1 and 2) is pressed downwardly to its advanced positionwith its lower face in the plane of the lower face of the die by a pairof push pins 56 slidable through apertures in a pair of abutting plates51 and 58 carried in shouldered recesses in the die I1 and the die andpunch head l5, respectively. The push pins 56 are normally maintained intheir lowered position, as shown in Figs. 1 and 2, by a backing plate 59acted upon by a compression spring 60, the plate and spring being freeto move in an aperture in the head l5. Carried in apertures in theshedder 53 and plate 51 is a shouldered perforator 63, which cooperateswith a die aperture 64 in the fixed punch Hi to punch an aperture 65(Fig. 5) in the terminal i8 simultaneously with the trimming of theterminal by the coaction of the die aperture 52 of the upper die I! withthe fixed lower punch I3. Suitable apertures are provided in the punchl6, bolster plate I2 and press bed I I through which the punchingsresulting in the aperture 35 are removed. It is to be understood thatthe dimensions of and clearances between the edges of the die aperture52 and punch l6 are such that, in the downward stroke of the upper diell, the metal of the terminal l8, at its free outer end, is sheared offto provide a rounded end and any ceramic and other materials on theedges of the terminal are trimmed away without appreciably trimming themetal thereat.

Extending upwardly from and fixed to the bolster plate I2 is a combinedterminal guide and guard member 65 for the space between the cooperatingpunch and die members l6 and 1 (Figs. 2 and 4), which is slotted, asindicated at 61, in line with the slot 30 in the resiliently mountedterminal nesting member 2|, the dimensions of the slot 61 and itsarrangement being such that the terminal may be freely inserted into thenesting slot 30 and against the stop member 32, where it rests on top ofthe fixed punch I6. Also formed in the member 36 at each side andaligned therewith are two slots 68 for receiving terminals on theresistor 20 other than the one terminal thereof to be worked, thearrangement of the slots 61 and 68 being such that resistors ofdifferent types and having more than one pair of terminals may havetheir terminals 8 worked upon.

In the operation of the punch and die apparatus, above described, aresistor 20, having a pair or more of laterally projecting terminals I8,is placed in position with one of its terminals inserted through theguide slot 61 in the guard member 65, with its outer end edge abuttingthe stop member 32, as clearly shown in Figs. 2 and 4. Thereafter,the'ram I0 is caused, in a usual manner, to descend to the positionshown in Fig. 3. In this movement of the ram I0, the lower face of thedie carried thereby engages the upper face of the resiliently mountedterminal nesting member 2| and depresses it against the action of thesprings 24. Thus, the outer free end of the terminal I8 is rounded offand any ceramic material on the opposed edges of the terminal is trimmedoff by the coaction of the edges of the die aperture 52 of the movabledie H with those of the fixed punch I6 as the movable die moves belowthe plane of the upper end face of the punch, as shown in Fig. 3.Simultaneously with'this forming and'trimming movement of the'die H, thelower faces of the perfora'tor "63 and the 'sh'edd'er '53 are moved intoengagement with'th'e'upper face of'the terminal l8 remaining in a fixedposition and as thepe'rforator 63, whichis fixed to and moves with-thedi'e 'll, continues its movement to perforate'the terminal, the shedderrecedes into the "die 11 against the action of the springfiil tothepo'sitio'n shown'in-Fig. 3. As the ram! [1 again'asoendsto'its'normal'position (Figs. 1 and2), the springpr'ess'ednesting'member 2| also moves upwardly to its normal position, limited bythe headed screws engaging the shoulders 260i" the apertitles '21. Alsoduring this latter movement of the no, the spring-pressed shedd'er 53retur'n's to its normal position relative to the die 'fl, thus leavingthe portion of the terminal [a sheared olT in forming its free outerrounded end lying-on the upper face of the fixed punchlB, at whichinstant a blast of air directed through the aperture 44, in the mannerpreviously described, lifts the'sheared-off portion of the terminalabove the stop'member 32, whereupon it is carried away along with theceramic and other particles trimmed from the terminal by the action ofthe air in the air exhaust system. It is to be noted that in'theoperative position of thedie I T (Fig. 3), wherein it abuts theupper face of the member 2l,'the slot is closed and sealed across itstop by the die ll, which serves to increase the effectiveness of the airexhaust system in removing ceramic and other particles fromthe'apparatus.

What is claimed is:

1. In an article working apparatus, a stationary support, a fixed punchmounted thereon, an element so constructed and arranged relative to andcooperating with said punch to form a nest for receiving and supportingan article movable longitudinally thereinto prior to the tools action,means for yieldably maintaining said element in a normal positionrelative to said punch to form said nest, a movable ram, and a diecarried by said ram and cooperating with said punch to work the nestedarticle.

2. In an article working apparatus, a stationary support, a fixed punchmounted thereon, an element substantially surrounding said punch, meansfor yieldably maintaining said element in a normal position relative tosaid punch to form, in cooperation with said punch, a nest for receivingand supporting an article movable longitudinally thereinto prior to thetool's action, a movable ram, and a die carried by said ram andcooperating with said punch to Work the nested article.

3. In an article working apparatus, a stationary support, a fixed punchmounted thereon, an element substantially surrounding said punch, meansfor yieldably maintaining said element in a normal position relative tosaid punch to form, in cooperation with said punch, a nest for receivingand supporting an article movable longitudinally thereinto prior to thetool's action, a movable ram, and a die carried by said ram eilectiveduring its operative movement to cause movement of said element topermit the die, in cooperation with said punch, to work the nestedarticle.

4. In an article Working apparatus, a st tionary support, a fixed punchmounted thereon, an element so constructed and arranged relative to andcooperating with said punch to form a nest for receiving and supportingan article movans longitudinally 'thereinto, I a stop member saidelement for "limiting the longitudinal'movement of the article into saidnest, in ans fdr yieldably maintainingsaid elment' in a'norfnal positionrelative "to said-punch to fo-rm said host, a movable ram, and adiecarriedfb'y 'said ram cooperating with said punch to work the-'nested article.

5. In an article working apparatus, a are tionary support, afix'ed'punch mounted therbn, anelement extendingaroun'd a-plurality ofsides ofsaid 'punch and havinga' slot extending'tr nsverselythereonsaidslot-beingo'p'en at one f saidphnchjmeahs for yieldabl'y maintaining delement in a normal position relative to said punch to -form I a nestfor receiving and supporting an article movable longitudinallythe'reliito, a movable ram,-"andjadie carried' by'saidranl-antlcooperatin with said punch to work the nested article.

-6. In an article working "app'a'ratus, a stationary base, a, fixedpunch inou'n'te'd -th'er'eon, an element extending around a plurality or"sides of said punch and having a slot open at each eiidextending-transversely of said punchin 'n' s for resiliently elevatingsaidelement to a n-dnnai pe sition above said punch whereby 'saicl =sl5tahd an upper end face of said punhforrn forde'ceiving and supportinganartielea rain,'and adie carried b'y said ram and-ecopeeating with saidpunch to work tnenestea article.

'7. In anartiele'workingapparatus, a 'stati-onary base, a 'fi xe'd punchmou nt'ed thereon, eiement extending around a plurality of s'ides (ifsaid punch and having -'a slot eaten-ding transversel'y thereof, saidslot being open at {one side of said punch, means for resiliently eievasaid element to a normal position above punch to for-In a nestforreceiving and-supporting an article movable mecca-many thereiiito, amovable ra-in, and a 'diecarried by'said ram for engaging and moving,during its operative movement, said element to permit the die, incooperation with said punch, to work the nested article.

8. In an article working apparatus, a stationary support, a fixed punchmounted thereon, an element so constructed and arranged relative to andcooperating with said punch to form a nest open at opposite ends forreceiving and supporting an article movable longitudinally thereintofrom one end of said nest, means for yieldably maintaining said elementin a normal position relative to said punch to form said nest, an airexhaust duct carried by said element communieating with said nest, astationary air exhaust duct cooperating with said first duct and inconstant communication therewith through which all waste materialresulting from the working of the article is sucked, a movable ram, anda die carried by said ram and cooperating with said punch to work thearticle.

9. In an article working apparatus, a stationary base, a fixed punchmounted thereon, an element substantially surrounding said punch andhaving a recess extending across its upper face in alignment with saidpunch for receiving and supporting, in cooperation with said punch, anarticle movable longitudinally thereinto, means for resilientlyelevating said element to a normal position above said punch to receivein said slot an article, an air exhaust duct carried by said element andcommunicating with said slot, a stationary air exhaust duct upon whichsaid first duct reciprocates and in constant communication therewiththrough which all waste material resulting from the working of anarticle is sucked by air, said ducts having cooperating guideways andguides, a movable ram,'and a die carried by said ram and cooperatingwith said punch to work the article, said die during its operativemovement being arranged to engage the upper face of said element todepress the same and to close the slot thereof across its top, thusincreasing the effectiveness of the air exhaust through said ducts.

10. In an article trimming and working apparatus, a stationary base, afixed punch mounted thereon, an element so constructed and arrangedrelative to and cooperating with said punch to form a nest open atopposite ends for receiving and supporting an article movablelongitudinally thereinto from one end of said nest, means forresiliently elevating said element to a normal position relative to saidpunch to form said nest, an air exhaust duct carried by said elementcommunicating with said nest, a stationary air exhaust duct cooperatingwith said first duct and in constant communication therewith throughwhich all waste material resulting from the working of the article issucked by air, said punch having formed therein a, channel through whicha blast of air is directed to blow waste material therefrom whereby itmay be sucked by air through said ducts, a movable ram, and a diecarried by said ram and cooperating with said punch to work the article.

11. In an article Working apparatus, a stationary support, a fixed punchmounted thereon, an element so constructed and arranged relative to andcooperating with said punch to form a nest for receiving and supportingan article movable longitudinally thereinto, means for yieldablymaintaining said element in a normal position relative to said punch toform said nest, an upper face on said punch to provide a support for thearticle before it is worked, a movable ram, and

a-die carried by said ram and cooperating with said punch to work thenested article.

12. In an article working apparatus, a stationary support, a fixed punchmounted thereon, an element substantially surrounding said punch, meansfor yieldably maintaining said element in a normal position relative tosaid punch to form, in cooperation with said punch, a nest for receivingand supporting an article movable longitudinally thereinto, said elementand said punch having surfaces lying in a common plane in the normalposition of said element upon which the article is supported, a movableram, and a die carried by said ram and cooperating with said punch towork the nested article.

13. In an article working apparatus, a stationary. support, a fixedpunch mounted thereon, an element substantially surrounding said punch,means for yieldably maintaining said element in a normal positionrelative to said punch to form, in cooperation with said punch, a nestfor receiving and supporting an article movable longitudinallythereinto, said element and said punch having surfaces lying in a commonplane in the normal position of said element upon which the article issupported, a movable ram, and a die carried by said ram efiective duringits operative movement to cause movement of said element to permit thedie, in cooperation with said punch, to work the nested article.

ARTHUR M. MISSBACH.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,310,068 Flower July 15, 19192,111,156 Schneider Mar. 15, 1938 2,144,684 McClung Jan. 24, 1939

